PHPunit fails with "Allowed memory size of 134217728 bytes exhausted (tried to allocate 5242880 bytes)" after upgrade to PHP 8.0.16 – PHP Versions

In my Laravel project I upgraded to currently latest Laravel 9.3.0 and PHP 8.0.16.

The original version was Laravel 8.64 with PHP 7.4.

I run the project in Docker containers with php:8.0.16-fpm-alpine image. Previous was php:7.4-fpm-alpine.

This is my Docker container config in docker-compose.yml file:

version: "3"
services:
  php:
    build:
      context: ./.docker-config/dockerfiles
      dockerfile: php.dockerfile
    volumes:
      - ./laravel:/var/www/html:delegated
    networks:
      - mynetwork

And here is the php.dockerfile:

FROM php:8.0.16-fpm-alpine

WORKDIR /var/www/html

RUN apk add --no-cache --repository http://dl-cdn.alpinelinux.org/alpine/edge/community/ --allow-untrusted gnu-libiconv
ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php

ENV PHP_MEMORY_LIMIT=2G
ENV PHP_UPLOAD_MAX_FILESIZE: 512M
ENV PHP_POST_MAX_SIZE: 512M

RUN docker-php-ext-install pdo pdo_mysql
# ...

As you see I set 2 GB for PHP memory limit.

When I run docker-compose run --rm phpunit I get this error:

PHPUnit 9.5.16 by Sebastian Bergmann and contributors.

...............................................................  63 / 281 ( 22%)
......................
   SymfonyComponentErrorHandlerErrorFatalError

  Allowed memory size of 134217728 bytes exhausted (tried to allocate 5242880 bytes)

  at database/migrations/2022_01_21_120600_create_tags_table.php:16
     12▕      * @return void
     13▕      */
     14▕     public function up()
     15▕     {
  ➜  16▕         Schema::create('tags', function (Blueprint $table) {
     17▕             $table->id();
     18▕             $table->string('name')->default('');
     19▕             $table->string('type')->default('');
     20▕             $table->string('color', 7)->default('');

Here is the referred migration file. I think, nothing special:

<?php

use IlluminateDatabaseMigrationsMigration;
use IlluminateDatabaseSchemaBlueprint;
use IlluminateSupportFacadesSchema;

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('tags', function (Blueprint $table) {
            $table->id();
            $table->string('name')->default('');
            $table->string('type')->default('');
            $table->string('color', 7)->default('');
            $table->timestamps();
            $table->softDeletes();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('tags');
    }
};

Earlier same error happend on different migration file.

Any idea what’s going on and how can I solve this issue?

Thanks!